Only "Airline Crew on Duty" are exempt from the tax according to the IATA tax list, it specifically says that ID, AD, DG, GE, IP and UD tickets are not exempt from the tax but the airlines may wish to absorb the tax themselves and not charge the passengers for it, but they will be invoiced for the tax regardless.

Thats what I thought, that it use to be the DE and DU and now the DU does not exist anymore, and when I want to use my online Travelex it does not how the RA or RD but a colleague of mine insists yes it is.....but I cannot find it anywhere so I thought I would check with my fellow members on airliners!!

Quoting DABTH747 (Reply 3):Thats what I thought, that it use to be the DE and DU

Well, actually the DU "tax" does exist! But this is not a German tax but a fee collected per ticket by LH. This applies to all ID tickets except duty travel and regardless if purchased via travelEx, ticket counter, etc.

BTW, "DU" is also used to indicate certain fees like rebooking and cancellation fees on full fare tickets

Oh oops! I didnt know that! I was just trying to find some sort of manaul or somethign that gives the list but seems very hard but thank you for all the info, I really appreciate it! By the way i like your username see you in YYZ sometime!?

Quoting LH470 (Reply 4):BTW, "DU" is also used to indicate certain fees like rebooking and cancellation fees on full fare tickets

Yup. "DU" is the code for administrative fee and it is used by many airlines. but if I'm not mistaken, I think it was used introduced and LH started collecting it initially for ID tickets issued on paper coupons, to cover the cost of the paper (which is surprisingly quite high for those coupons)?